Method of making printing-surfaces.



No. 655,|34. Patented July 3|, I900.

C. A. TRIPP.

METHOD OF MAKING PRINTING SURFACES.

(Application filed Feb. 5. 1900.)

(No Model.)

STATES PATENT rric nt CHARLES A. TRIPP, or rruns oiv, MASSACHUSETTS;

METHOD oF MAKING PRlNTlNG S'URFAC ES SPECIFICATION forming part ofLetters mes no. 5,134, dated July 31, 190i);

Application filed February 5, 1900.

To all whom, it may concern:

Be it known that I, CHARLES A. TRIPP, a citizen of the United States,residing at Hudson, in the county of Middlesex and State ofMassachusetts, have invented certain new and useful Improvements inMethods of Making Printing-Surfaces; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

This invention relates to the method of producing printing-surfacesprincipally used in connection with water color inks in order to insuresolid printing and which have theletter, design, or character to beprinted in solid outline and the space between the outline filled inwith felt or like ink-absorbing ma-' terial.

In practicing the invention a matrix or mold of the design, character,or the like is constructed in any of the well known ways. Pieces offelt, textile, or like ink-absorbing material of less dimensions eachway than the actual printing-surface are placed in the mold, so as toleave a margin. The material to form the base or body of the printingtype or surface is pressed into or supplied to the. mold andsimultaneously assumes the required shape and adheres to the absorbentmaterial, the marginal portion surrounding the felt being integral withthe base and sustaining the pressure and wear when the printing isexecuting.

In the drawings, Figure 1 is a plan view of a printing-surfaceconstructed in accordance with the invention. Fig. 2 is a sectionthereof. Fig. 3 is a detail sectional view of a matrix,illustratin g themethod of operation. Fig. t is a detail view showing the manner ofconstructing a printing-surface, with the felt or absorbent projectingslightly beyond the surface of the marginal portions. Fig. 5 is a detailview showing the invention effected by the chalk-plate-engravingprocess.

Corresponding and like parts are referred to in the followingdescription and indicated in all the views of the drawings by the samereference characters.

The letter, character,design,or figure forming a pattern for the type orprinting-surface to be constructed is utilized for the construc-SerialNo. 4,014. (No specimens.)

tion of a-rhold or matrix in any of the well known ways. Pieces of felt,textile, or like ink-absorbing material 1 are placed in the mold 2, carebeing exercised to have them of less extent in every direction than theextent of the actual printing-surface, so as to leave a marginal spacefor the reception of the materialconstituting the base or body of thetype. The material to form the body or base 3 of the type orprinting-surface is pressed, poured, or otherwise supplied to the moldand flows over and around the felt and completely fills the mold. Theplastic'or fluid condition of the material forming the base whensupplied to the mold causes it to ad here to the felt and fill everyportion of the mold. The marginal portion 5, surrounding the felt,receives the wear and pressure when printing and prevents the packing ofthe felt. When the base or body isof rubber, the lat= ter is vulcanizedwhile under pressure, the vnlcanizing process hardening the rubber andcausing it to adhere to thefelt by fusion.

In some cases it is found necessary to have the felt project beyond themarginal portion in order to allow for'the packing of the felt and alsothe shrinkage from wetting. To accomplish this, after the felt has beenplaced in the mold liquid plaster-of-paris or any like material ispoured around the edges of the felt to a depth of from one thirty-secondto one-sixteenth of an inch, as shown at 4 in Fig. 4, and then therubber or metal run into the mold as before.

In using this process in connection with the chalk-plate-engravingprocess, as shown in Fig. 5, the chalk 7, applied to the plate 6, iscutclear through tothe surface of the plate only where it is desired toplace the felt 1. To form the marginal portions 5, the chalk is not cutthrough to the surface of the plate 6,

as shown at 8, which is about one thirtysecond of an inch thick tocorrespond with the thickness of felt tobe left projecting beyond theface of the part 5 to allow for packing. The part 7, with the part 6,constitutes the matrix 2, carrying the design for forming the type 3.

Having thus described the invention, what is claimed as new isl. Theprocess of forming a type or printingsurface which consists in supplyingto the matrix carrying the design, pieces of inkabsorbing material ofless dimensions than the actual'printing surface or design, then fillingthe matrix with a plastic composition which simultaneously adheres tothe'felt and flows about the edges thereof forming marginal protectingportions, substantially as described.

2. The process'of forminga type or printing-surface which consists insupplying to the matrix carrying the design, pieces of ink absorbingmaterial of less dimensions than ing-surface which consists in supplyingto the matrix carrying the design pieces of inkabsorbing material ofless dimensions than the actual printing surface or design, then partlyfilling the space around the said pieces of ink-absorbing material witha spacing material to a depth less than the thickness of said'pieces,then filling the matrix and the remainder of the space around theink-absorbing pieces with the material to form the base or body of thetype, substantially as described. I r

In testimony whereof I aflix my signature in presence of two witnesses.

CHARLES A. TRIPP.

Witnesses: 7

WM. M. GRAHAM, CARRIE E. MOSHER.

